Lab 05 e-m IVC 2009

Lab 05 e-m IVC 2009 - Measurement of Charge to Mass Ratio...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Measurement of Charge to Mass Ratio Experiment Equipment: 1) Apparatus for e/m 2) Power supply 3) Flashlight 4) Two multimeter DMM 5) Leads 6) Compass if available Laboratory Objectives 1) Observe the deflection of an electron beam in a magnetic field. 2) Determine the electron charge to mass ratio e/m. e/m laboratory pg 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Theory of charge to mass Experiment If a charge q moves with a velocity v in a magnetic field B that is at a right angle to the direction of motion, it will experience the magnetic part of the Lorentz force : F B = qvB We will use this fact to determine e / m of the electron by measuring the radius of that circle. To this end we must: · produce a narrow beam of electrons of known energy , · produce a uniform magnetic field, · find a way to measure the radius r of the circular orbit of the electrons in that magnetic field , and · find the relation between that radius and the ratio e / m . e/m laboratory pg 2
Background image of page 2
consists of a special tube in which a beam of electrons is emitted from a heated filament (cathode) and attracted toward an anode at electric potential V . e/m laboratory pg 3 A small amount of mercury vapor present in the evacuated tube becomes ionized upon collision with the electrons. During electron collision with the mercury atoms, visible
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/05/2011 for the course PHYS 4B taught by Professor W.christensen during the Summer '09 term at Irvine Valley College.

Page1 / 11

Lab 05 e-m IVC 2009 - Measurement of Charge to Mass Ratio...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online